Arctix Youth Classic Cold Weather Reinforced Pants. This reinforced version of our classic pant is designed for the kid who punishes their gear. Whether on the slopes or in the backyard, the reinforced knees and seat are ready to withstand high demand. 100% Nylon ThermaLock Fabric. ThermaTech Insulation offers warmth in a light weight, low bulk garment. Water and wind resistant. Adjustable waist allows the pant to fit comfortably. Reinforced scuff guard, hems, knees and seat. Snow gaiters to form a seamless integration with boots. Nylon reinforced knee panel.